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smtpd_recipient_restrictions =
    permit_mynetworks,
    permit_inet_interfaces,
    permit_sasl_authenticated,
    #reject_unknown_reverse_client_hostname,
    reject_invalid_helo_hostname,
    reject_non_fqdn_helo_hostname,
    #reject_unknown_helo_hostname,
    reject_unauth_destination,
    reject_unauth_pipelining,
    reject_non_fqdn_sender,
    reject_non_fqdn_recipient,
    check_helo_access hash:/etc/postfix/helo_checks,
    check_client_access hash:/etc/postfix/client_checks,
    check_sender_access hash:/etc/postfix/sender_checks,
    check_recipient_access pcre:/etc/postfix/recipient_checks.pcre,
    check_policy_service unix:private/spf
    reject_unknown_sender_domain,
    reject_unknown_recipient_domain,
    permit